Misleading error message in try_run

Usage
1

I am trying to run a very simple C++ program during configuration. My first attempt:

Test.cxx:

#include <iostream>

int main()
{
   std::cout << "test" << std::endl;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.14)

project(test LANGUAGES CXX)

try_run(
	RUN_RESULT
	COMPILE_RESULT
	${CMAKE_SOURCE_DIR}/Test.cxx
	COMPILE_OUTPUT_VARIABLE COMPILEOUT
	RUN_OUTPUT_VARIABLE RUNOUT
)

But got this:

CMake Error ...
  The test project needs language C which is not enabled.

I was confused by the message and first thought I needed to tell try_run somehow which language it needs to compile, but couldn’t find any according information in the documentation…

I then realized that I had forgot to specify SOURCES in front of my .cxx file. I know it was my stupid mistake, but if possible, it might help future users to get a more meaningful error message, such as “No source files specified” in that case?

2

Cc: @Matthew_Woehlke